New module: BBDuk

[jfy133]

This is a standalone module from BBMap, which partly uses in BBDuk, however BBDuk 'standalone' produces different stdout (log) files, thus the module.

• There is example tool output for tools in the https://github.com/ewels/MultiQC_TestData repository or attached to this PR: Add test data for BBduk test-data#239
• Code is tested and works locally (including with --lint flag)
• docs/README.md is updated with link to below
• docs/modulename.md is created
• Everything that can be represented with a plot instead of a table is a plot
• Report sections have a description and help text (with self.add_section)
• There aren't any huge tables with > 6 columns (explain reasoning if so)
• Each table column has a different colour scale to its neighbour, which relates to the data (eg. if high numbers are bad, they're red)
• Module does not do any significant computational work

[ewels]

Ok, I've made quite a lot of changes here so please have a thorough review if you can.

• Rewrote the log parsing to use regexes, and to parse the base numbers as well as read counts
• Take the sample name from the first input file name, rather than the log file name
• Removed most General Stats columns
• Added the filtering types to the bar plot
• Added base count as a second dataset to the bar plot
• Removed the beeswarm plot

Let me know what you think!